(1B) The product $(a+b)(c+d)$
Practice
Expand and simplify.
*Write your answers with powers of $x$ in descending order. $\left(\square x^2 \pm \square x \pm \square\right)$
$\left(x-6\right)\left(x+3\right)$
$\left(x+4\right)\left(x-3\right)$
$\left(x+7\right)\left(3-x\right)$
$\left(-x+7\right)\left(1-x\right)$
$\left(-7+x\right)\left(-x+4\right)$
$\left(1-x\right)\left(-x+5\right)$
$\left(7+x\right)\left(-8+x\right)$
$\left(4+x\right)\left(8-x\right)$
$\left(5x-3\right)\left(-8x+1\right)$
$\left(-3x+2\right)\left(3x-1\right)$
$\left(-7x+3\right)\left(3-4x\right)$
$\left(9x-1\right)\left(5+3x\right)$
$\left(5+8x\right)\left(x-4\right)$
$\left(2-9x\right)\left(4x-5\right)$
$\left(3-x\right)\left(7+6x\right)$
$\left(1-x\right)\left(5-8x\right)$